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<p>Implements a complex-number type.
</p>
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<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Keywords">edit</a>]</span> <span class="mw-headline" id="Keywords">Keywords</span>
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<p><strong class="selflink"><tt>_Complex</tt></strong>
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<h3>
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<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="co2">#include &lt;stdio.h&gt;</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
   <a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"sizeof(_Complex float)       = %2zu<span class="es1">\n</span>"</span>, <span class="kw4">sizeof</span><span class="br0">(</span>_Complex <span class="kw4">float</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
   <a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"sizeof(_Complex double)      = %2zu<span class="es1">\n</span>"</span>, <span class="kw4">sizeof</span><span class="br0">(</span>_Complex <span class="kw4">double</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
   <a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"sizeof(_Complex long double) = %2zu<span class="es1">\n</span>"</span>, <span class="kw4">sizeof</span><span class="br0">(</span>_Complex <span class="kw4">long</span> <span class="kw4">double</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
 
    <span class="coMULTI">/* definition, initialization, and printing of _Complex variable */</span>
    _Complex <span class="kw4">double</span> z, zc<span class="sy4">;</span>
    __real__ z <span class="sy1">=</span> <span class="nu16">1.0</span><span class="sy4">;</span>  __imag__ z <span class="sy1">=</span> <span class="nu16">2.0</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"%.1f%+.1fi<span class="es1">\n</span>"</span>, __real__ z, __imag__ z<span class="br0">)</span><span class="sy4">;</span>
 
    <span class="coMULTI">/* complex assignment */</span>
    zc <span class="sy1">=</span> z<span class="sy4">;</span>
 
    <span class="coMULTI">/* complex conjugate */</span>
    __imag__ zc <span class="sy1">=</span> <span class="sy2">-</span>__imag__ z<span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"%.1f%+.1fi<span class="es1">\n</span>"</span>, __real__ zc, __imag__ zc<span class="br0">)</span><span class="sy4">;</span>
 
    <span class="coMULTI">/* complex product */</span>
    <span class="coMULTI">/* (a+bi)(a-bi) = a^2 + b^2 */</span>
    z <span class="sy1">=</span> z<span class="sy2">*</span>zc<span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"%.1f%+.1fi<span class="es1">\n</span>"</span>, __real__ z, __imag__ z<span class="br0">)</span><span class="sy4">;</span>
 
    <span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>Possible output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">sizeof(_Complex float)       =  8
sizeof(_Complex double)      = 16
sizeof(_Complex long double) = 32
1.0+2.0i
1.0-2.0i
5.0+0.0i</pre></div></div> 
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